1) In 100% case it is not possible by HE itself. You need a tool (as Stefan has suggested) for 1.4x or background script (will be available in 1.50) to resolve your request and find+open corrsponding file. Another possibility to reuse ctags tool for parsing. In this case plugin will be necessary (also from 1.50). There will be one build in feature in 1.50 which can help, but it will work rather rare. HE 1.50 search for labels on Smart Navigate though all open documents. So, if you do not have label (class definition) for Config_Manage in current file HE will search all open documents for lable with such name (class definition) and will jump there.

2) Normally editor should inform you about update, if you have not disabled confirmation popup some when. Or another reason, from some recent versions, HE updates non-modified and not edited in current session files silently. There is some flag to disable this.